Problems with pipeline welding
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This post was last edited by “Such a Same Name” on March 8, 2019, at 18:17. A 100-diameter pipe is welded onto a 150-diameter pipe; there’s no need for a tee fitting—just make an opening directly on the 150-diameter pipe. Is it allowed according to the standards? GC1 pipeline
It depends on the type of pipeline in question. You can refer to clause 5.1.7 of Part 3: Design and Calculation in GB/T 20801-2006; these are the relevant regulations for industrial pipelines, and they are also generally applicable to long-distance pipelines, utility pipelines, and power pipelines! I hope this helps! :victory:
The open-hole weld has been calculated; it’s fine now.
What medium? Operating conditions? It depends on the specific situation.
It’s worded ambiguously; it’s generally not allowed
Yes, it is necessary to conduct opening reinforcement calculations； But in large design institutes, it must have been calculated already, and there is an internal calculation-based reference manual
Not allowed; use a tee or branch fitting
I doubt it; have the design calculate the stress!
For medium and low pressure systems, it is generally permissible to make direct openings in branch pipes that are less than 1/2 the diameter of the main pipe; reinforcement is required, or standard tees or welded protrusions can be used
GC1 class pipes are not allowed